Coating material and process and apparatus for the manufacture thereof



Nov. 4 1924. 1,514,226

M. PREISS COATING MATERIAL AND PROCESS AND APPARATUS FOR THE MANUFACTURE THEREOF Filed June 18 1924 Jr; Ventor'.

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Patented Nov. 4, 1924.

NITED STATES PATENT OFFICE.

MAX PREISS, OF WITTENBERG, GERMANY.

COATING MATERIAL AND PROCESS APPARATUS FOR THE MANUFACTURE THEREOF.

Application filed June 18, 1924. Serial No. 720,833.

ful Improvements'in a Coating Material and Process and Apparatus for the Manu-,

facture Thereof, for which he has filed ap plications for patents in Germany Mar. 5, 1923; Belgium May 10, 1924; France May 10, 1924:; England May 19, 1924, and of any colour desired, either by sorting the pa- :per shavings into reds, blues, yellows, etc., and working each color up separately, or

Which the following is a specification.

This invention relates to coating materials and has for its object the provision of a new coating material and processes and apparatus for its manufacture. The new coating material differs from similar substances already known in that it consists of dead beaten paper pulp, worked up into a froth and then concentrated. It can be used for coating walls, wooden articles andthe like.

In order to make the new coating material use is made preferably of paper shavings, it

being best to take a mixture of several kinds of paper, as for example newspaper, 30% letter paper and writing books and 10% packing paperor the like. This mixture is soaked thoroughly, pulped and then water is added up to a density of about 23%, to produce a viscid or thickly fluid paper pulp. The pulping is carried out preferably in a kneading machine from which'the kneaded pulp falls into a mixing chest so that it can be diluted and uniformly stirred up therein. From this chest thepulp is pumped into a stuff-engine or refining mill or conemill and is so ground up therein, if necessary with the addition of glue material, that a complete or almost complete crushing up of the fibre takes place and a kind of deadbeaten pulp flows out of the mill; This pulp is then diluted to a density of about 1%, whereupon it is converted into froth or lather which is thickened by stirring; this thickened product constitutes the coating material of the invention. All that is not converted into lather or froth is returned into the processes of manufacture so as to again pass wholly or partly through the treatment mentioned above. The production of the improved coating material takes place continuously. The conversion of the dead-beat, diluted pulp intofroth or lather can be carried out in a machine "fitted with scribed above to boaters, or it is allowed to flow over sand traps and to fall from one to the other of these in a cascade-like manner, or it is induced to froth or lather by the admission of air or other gas. The froth or lather obtained is guided into a mixing vessel where is is concentrated or thickened; a cement-' like mass becomes deposited in the mixing vessel and represents the improved coating material.

This coating material'can be obtained in wood pulp or cellulose or rags etc., may be taken, or a mixture'of some or all of these raw-materials, and paper pulp be prepared with theaddition of size and loading materials in the machines'generally employed in the manufacture of paper (edge runners, rag-engines, cone mills and the like), but in suchwise, however, that the fibrous materials will completely or almost completely lose their fibrous character. The product obtained is run oif into a mixing chest, diluted and then worked up in the manner deproduce the finished coating material. Preferably those raw-materials will be used which tend to form froth or lather, such as mechanical wood pulp from resinous pine wood, as glue resin size and those loading materials which can be broken up most finely (talc, china-clay and the like) the manufacturing water must also be processes, especially over the sand trap of the paper machine, and then thickenin condensing same.

The thickened pro uct then also forms the-new coating material which is used either in its natural colour or suitably tinted.

In the drawing there is shown by way of no I example apparatus for carrying out thenew process. In said drawings:

Figure lis a longitudinal section through the apparatus,

gigure 2 is a plan view of the apparatus, an

Figure 3 is a section through the froth producer and the froth mixing vessel.

The raw or starting material (paper shavings, mechanical wood pulp or the like) already ground up in an edge runner (not shown) is put into the rag engine a, wherein it is dead beat or almost dead beat to a density of 5% (which may last some hours) and it is then let into the mixing chest 0 through the pipe I). This chest is provided with mixing gear (I and a scoop wheel e. The

material in the chest 0 which material has a density of about 2%, is uniformly stirred up and raised by the scoop wheel e into the drain box 7 whence ,it flows into the mixing box g. It is then still further diluted to a density of about 1%, by allowing fresh and waste water to flow in through the pipes h and 1'. By means of the centrifugal pump 70 -paper material with loading and glue ma- Y the diluted matter is raised into the box Z whence it goes to the scum producer m which consists, for example, of three superimposed conduits 0,'o", 0 provided with ribs 42. From the box Z the current of matter falls into the first conduit 0, carries air along with it and continually forms scum which, however, heaps itself up in the conduit 0.. At the shaft p the matter falls down into the second conduit 0, again forms scum, then falls at the shaft 17 down into the third conduit 0 again forming scum. The rest of the liquid matter flows into the box 9 whence it is returned into the cycle of the manufacturing process by means of the pump 1", for example partly into the mixing box g, and partlyinto a receptacle 8 located above the stuff engine a, from which receptacle it is also brought into use when charging the rag engine a.

The scum continually accumulating and heaping up above the conduits 0, 0 0 falls through the open side wall 13 into the scum condenser u, in which an agitator mechanism '11 rotates and breaks up the scum. At the lower part in the condenser 10 there is continually deposited a cement-like mass which is continually conveyed to the receptacle a: by a scraper w.

Besides the arrangement described still others are possible, only they, must allow of the new process being carried out. a

The new coating material has the form of a soft somewhat thickish paste which coating processes and applied with a brush.

One coating alone is generally sufficient,

but several coatings may be applied one on top of the other but of course the lower coating must be allowed to dry before the next is. applied. The new material can be sprayed on or blown on producing any desired thickness of coating by means of the known compressed air devices. By applying the new material to the walls of rooms, in the manner described for example, a kind of one coloured Wall paper, applied in liquid form, is obtained, which can be made lustrous by merely brushingit or it can be provided with brilliant designs by brushing it over through stencils; as when pargeting, coloured designs can also be applied with a brush using the same material. I

What I claim and desire to secure by Letters Patent of the United States is 1. A process for the manufacture of a coating material which comprises mixingterials, grinding the mixture until substantially complete disintegration of the fibres is obtained, diluting the mixture, beating up the same to form a scum, condensing the scum, and returning for re-treatment any material which fails to turn to scum.

2. A process for the manufacture of a coating material which comprises mixing paper material with loading and glue materials, grinding the mixture until substantially complete disintegration of the fibres is obtained, diluting the mixture, beating up the same to form a scum, collecting and condensing the scum -to form the coating material, and treating the remaining mixture to form paper material.

3. Apparatus for use in carrying out the process described, comprising a scum generator, means whereby the material is caused to fall into the generator in cascade form, a scum condenser, means for guiding the scum from the generator to the condenser and stirring and scraping mechanism for the scum material in the condenser.

4. A material for use as a covering, formed by grinding paper material in admixture with loading and glue materials .until substantially completely disinte rated,

by diluting the mixture, beating to orm a scum and by condensing such scum.

, MAX PREISS.

Witness.

I. Gunsonnn. 

